Question

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please answer this question

in 2 min

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Answer 1

Answer:

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Answer 2

Answer:

Time taken by the train in first interval

time = d/s = d/60    

Now, Time taken by the train in second interval    

time = d/s = 2d/80    

Now,  

average speed = total distance covered/ total time taken    

average speed = (d+2d)/(d/60+2d/80)    

average speed = 3d/(10d/240)    

average speed = 3d×240/10d    

average speed = 3d×24/d    

average speed = 72 km/h

Explanation:

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